Alarm system.



L. GIESE.

ALARM SYSTEM.

APPLICATION FILED JULY 16,1908.

Patented May 25,

' INVENTOH lea (5866? BY M mw/ Q0 ATTORNEYS To all whom it may concern:

- liquid conductor.

LEO GIESE, OF FORT WORTH, TEXAS.

ALARM SYSTEM.

Specification of Letters Patent.

Patented May 25, 1909.

Application filed July 16, 1908. Serial No. 443,813.

Be it known that I, TJEO GIEsE, a citizen of the United States, and a resident of Fort Worth, in the county of Tarrant and State of Texas, have invented a new and. Improved Alarm System, of which the following is a full, clear, and exact description.

This invention relates to certain improvements in alarm systems, and more particularly to a circuit breaker adapted to operate upon a predetermined increase in temperature or upon being mechanically bent or broken.

The object of the invention is to so construct the device that the minimum quantity of fusible material need be employed, and so supported that upon being broken or fused, it becomes entirely displaced and the circuit broken.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference in icate corresponding parts in both thefi ures, and in which Figure 1 is a diagrammatic view of a system includingmy improved circuit breaker; and Fig. 2 is a vertical section. through a circuit breaker constructed in accordance with my invention.

The specific form of circuit breaker illustrated in the accompanying drawing includes a tube 10 of copper or other heatconducting material, and having means for subdividing it into two separate chambers or compartments 11 and 12. This subdividing means preferably comprises a constricted portion 13, normally closed by a small plug 14 of wax or other substance of very low melting point. The lower compartment or chamber 12 is normally empty, While the up or compartment or chamber 11 is normally filled with mercury 15 or other The upper compartment is hermetically closed by a lug 16 of hard rubber or other solid insu ating material, and two wires 17 and 18 extend through the solid plug into the mercury, their inner ends being amalgamated with mercury.

In a fir'e alarm system, I arrange a pluralit}: of circuit closers'at any and all points w ere it is desired to indicate the presence of ,ries, back to the battery.

the armature 28 in position.

any dangerous increase in temperature. In Fig. 1, I have shown diagrammatically a system in which a plurality of the circuit closers are arranged in abattery circuit. A wire 19 leads from a battery 20 through a suitable electromagnet 21 and thence through the several circuit breakers in se- For giving the alarm, I provide a bell 22, adapted to be operated by a spring motor, the motor being held from operating while a current flows through the electromagnet. As shown, the hammer 23 of the bell is provided with a slot 24, through which an eccentrically-mount-ed pin 25 of a wheel 26 extends. The wheel is rotated by a spring motor, not shown, and in gear with the wheel 26 is a ratchet wheel 27. is provided with a catch or dog for engagement with said ratchet wheel. The circuit flows continuously through the electromagnet and the terminals 17 and 18 and the mercury 15 of each of the circuit breakers, and the armature 28 is held inposition to look the spring motor against operation. In case of any dangerous increase in temperature, the wax or other fusible plug of one or more of the circuit breakers will melt and the mercury will be permitted to flow out of the chamber 11 down into the chamber 12. The breaking of the circuit between the terminals 17 and 18 will denergize the electromagnet and the armature 28 will drop to permit the operation of the springmotor. The operation will be the same if the lower end of the tube be bent, twisted or jarred as the plug 14 is frangible when cold and is readily loosened so that it may drop into the lower compartment, even though the temperature be not raised.

There is no necessity for more current than the minimum amount required to maintain In order to save the current, I may, if desired, introduce a resistance 29, whereby the current maybe varied to suit the demands of the-electromagnet and the strength of the", ,loat't'e'r y,';

Having thus described my invention, I claim as new and desire to secure by Letters Patent: 7

' In combination, a tube having acon- The armature 28 of the electromagnet striated portion intermediate its ends, afusi- In testimony whereof I have signed my ble plug Within said constricted portion and name to this specification in the presence of subdividing the tube, into two comparttwo subscribing witnesses.

ments, mercury within the compartment LEO GIESE. 5 above the plug, and two electric terminals Witnesses:

spaced apart and extending into one of said W. D. HOUSE,

compartments. I I J. E. ALBRIGHT. 

